Basic HTML version of Foils prepared May 30 99

Foil 9 Secret Key Authentication

From Basic Mathematics of Security Systems CPS714 Computational Science Information Track -- June 2 99. by Geoffrey C. Fox
Each individual A and B picks a random number rA and rB which are only known to themselves and a fresh for session to be authenticated. There is shared key KAB which is not to be transmitted but A needs to know that B knows KAB and B needs to know that A knows KAB. The random numbers are known as challenges.
rA
Decrypt xA and see it gives rA
Encrypt rA to give xA
xA
rB
Encrypt rB to give xB
xB
Decrypt xB and see it gives rB

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